Which of the following is not true regarding neon lights?
a. light is emitted as electrons move through a gas in a tube.
b. all neon lights are colored by the color of the tubing.
c. neon lights may contain other gases, such as helium or krypton.
d. each kind of gas produces its own distinctive color.

‘All neon lights are colored by the color of the tubing’ is NOT true regarding neon lights. The answer is letter B. Neon lights are emitted as electrons in a gas tube, it consist of helium and krypton and each gas produces its own distinctive color.

b. All neon lights are colored by the color of the tubing.

Explanation:

Neon is a noble gas. A glass tube is filled with neon gas. When potential difference is created across the tube, the electrons rush towards positive terminal and cation towards negative terminal.

As these electrons rush towards positive terminal, they collide with each other. The light is generated when electrons become excited. When they fall down to their original state, that energy is released as photon of light.

The glass tube an be filled some other noble gas such as krypton or helium. Each gas would produce its own different color. The color depends upon the gas filled inside the tube and not the color of the tubing.